https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67033
Bug ID: 67033
Summary: [c++11] template argument invalid for integral
constant expression beginning with address-of
expression
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ed at catmur dot co.uk
Target Milestone: ---
template<bool B> struct S { };
int x;
S<&x == &x> s;
// error: template argument 1 is invalid
// ^
&x == &x is a valid converted constant expression of type bool.
The problem is that cp_parser_template_argument sees the initial '&' and
decides that the non-type template argument must be the address-of operator
applied to an id-expression; when it fails to reach the end of the template
argument it aborts.
This behavior is valid for <= C++03, where '&' cannot appear in a constant
expression, but C++11 is more relaxed.
